JPH11241776A - Closing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closing device of an opening of a tank or a conduit where operation is simplified. SOLUTION: This closing device 3 of an opening 2 of tank or conduit has a closing plate 3 of the opening 2 which can move toward or away from the opening 2 substantially vertically to the plane of the opening 2 so as to be pressed onto a wall 1 in which the opening 2 is formed, and can displace substantially in parallel with the plane of the opening 2 at a position away from the opening 2, first and second piston-cylinder units 5, 12 which respectively displace the closing plate 3 in parallel with or vertically to the plane of the opening 2 and have housings 4, 13 equipped with cylinder holes 8, 14, 15 and pistons 9, 16, 17 displaceable in the holes, and conduit means 21, 23, 24, 26 for guiding a pressure medium into the cylinder holes 8, 14, 15 of both piston-cylinder units 5, 12 to displace each cylinder in each cylinder hole.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device for closing an opening in a tank or a conduit, wherein the opening is substantially perpendicular to the plane of the opening so as to be pressed against the wall formed by the opening. Moveable away from the opening;
And a closing plate of the opening displaceable substantially parallel to the plane of the opening at a position spaced from the opening; displacing the closing plate parallel to the plane of the opening; A piston-cylinder unit having a housing with at least one piston displaceable therein.

[0002]

2. Description of the Related Art Closure devices of the type described above are well known. Usually, they are called slide devices. The operation of such a device involves a number of different operations. The slide plate is moved substantially parallel to its plane to its open or closed position. In its open position, the closure plate is located beside the opening to be closed. In its closed position, the closure plate covers the opening. To close the opening, the closure plate is pressed against the sealed end of the opening. The closing device described above is disclosed in U.S. Pat. Nos. 4,470,576, 3,368,792, 4,560,141; German Patent 3,209,21.
No. 7, No. 3,643,069, No. 2,528,043
No. 3,224,387 and No. 2,551,42
No. 9. A common feature of conventional devices is that they all require expensive mechanical elements to move the closure plate from its closed position to the sealed position.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a closing device in which the above-mentioned operation is substantially simplified as compared with a conventional device.

[0004]

SUMMARY OF THE INVENTION The present invention, in order to achieve the above objects and other objects which will become apparent hereinafter, provides a device for closing an opening in a tank or conduit which presses against a wall formed with the opening. Moveable toward and away from the opening substantially perpendicular to the plane of the opening, and substantially parallel to the plane of the opening at a location spaced from the opening. A closing plate of the opening being displaceable to
A first piston-cylinder unit having a housing with a cylinder bore and at least one piston displaceable in the bore, displacing the closure plate parallel to the plane of the opening; The closure plate being moved toward and away from the opening perpendicular to the plane and having a cylinder bore and at least one piston displaceable within the bore, and connected to the closure plate; A second piston-cylinder unit for moving the cylinder toward and away from the wall where the opening is formed, and a first and second unit for displacing each cylinder in each cylinder bore.
Conduit means for guiding the pressure medium to the cylinder bore of the piston-cylinder unit.

[0005] The present invention provides for displacing the closure plate in its plane by using a simple pneumatic sequence control by providing the second piston-cylinder unit and the conduit means. Can be moved into the opening to achieve sealing of the opening.

[0006]

BRIEF DESCRIPTION OF THE DRAWINGS The features and objects of the present invention will become more apparent and the invention itself will be best understood by reading the following detailed description of the preferred embodiment with reference to the accompanying drawings, in which: FIG. .

FIG. 1 schematically shows a tank wall 1 (not shown in detail), an opening 2 which can be closed with a closing device 3 according to the invention. The closure device 3 has a housing 4 which is fixed to the wall 1 by suitable means such as screws. The housing 4 includes a first piston-cylinder unit 5 having a two-stage cylinder hole 8 having an upper hole 7 and a lower hole 6 having a larger diameter.
The terms “above” and “below” are used corresponding to the position of each part on the drawing. The piston 9 has a larger diameter hole 6
Is displaced within. On each side of the piston 9 there are two piston rods 10 and 1 having different diameters.
1 is provided. The diameter of the piston rods 10, 11 is such that the ratio of F1: F2 is approximately 3: 4 or 0.7 so that the upper surface F1 of the piston 9 is smaller than its lower surface F2.
It has been chosen to be equal to 5. 1st piston-
The cylinder unit 5 has a conventional seal, which is obvious and not specifically shown. The sealing body is composed of piston rods 10, 1
It is provided on the piston 9 together with or in one of the guiding means. The same is adopted for the second piston-cylinder unit 12 described in detail below. Piston rod 1
1 remains in the housing 4 at each position of the piston 9 during each stroke of the piston 9. The piston rod 10 protrudes downward from the housing 4 and moves the second piston-cylinder unit 12 that contacts the lower end thereof. The second piston-cylinder unit 12 has a housing 1 with two cylinder holes 14, 15 having different diameters and in which pistons 16, 17 are respectively displaced.
Three. The two pistons 16, 17 are
And 15 are connected by a common piston rod 18 extending through an intermediate wall 19 separating the two. At one end of a piston rod 18 protruding from the housing 13,
A closure plate 20 provided with an annular sealing surface is provided. The pistons 16 and 17 have different piston working surfaces F3 and F4, respectively, and the ratio of F3: F4 is about 1: 2.
Or 0.5.

[0008] Both piston-cylinder units 5 and 12 are acted upon by a pressure medium (compressed air) sent through a pressure medium conduit 21. The pressure medium conduit 21 extends to the bore 6 of the cylinder bore 8 and into which the piston working surface F1
The top is open. Piston 9 and piston rod 10
Extends through the entire housing 13 and has a working surface F3
Is penetrated by a long hole 23 which opens into the cylinder hole 14 at the position. The branch line 24 is connected to the pressure medium line 21. The branch conduit 24 opens to the lower part of the hole 6 of the cylinder hole 8. The hole 6 communicates with the cylinder hole 15 of the second piston-cylinder unit 12 via a second long hole 26 formed in the piston rod 10.
In the cylinder hole 15, the second elongated hole 26 is open on the side of the piston working surface F4. Both positions of the spool of the valve 25 are shown in FIG. In the position shown in FIG. 1, ie in the open position of the closing device, the branch conduit 2
The pressure medium flowing through 4 acts on the face F2 of the piston 9 and on the face F4 of the piston 17. The pressure inside all branch conduits and all holes is kept the same, and the elements of the closure device occupy the positions shown in the drawing.

As shown in FIG. 1, the pistons 9, 1
6, 17 are receiving the same pressure. According to the above-described ratios of the piston surfaces F1 and F2 and F3 and F4, the pistons 9 and
16 and 17 are held in the positions shown in FIG.

When the position of the spool valve 25 changes, while the pressure in the conduit 21 is maintained, the branch conduit 24
Exhausts into the atmosphere. The pressure acting on surface F2 decreases until the pressure acting on surfaces F1 and F2 is equal. As a result, a greater pressure acting on the surface F2
As acting on 1, the piston 9 moves downward and the closing device assumes the position shown in FIG. At this time, the second
Pistons 16 and 17 of piston-cylinder unit 12
Occupies the same position as in FIG. As the piston 9 moves downward, the volume below it decreases. The pressure difference between the holes 14 and 15 of the piston-cylinder unit 12
, The closure plate 20 remains in the same position as in FIG. When the piston 9 reaches its lower end position, the pressure in the bore 15 acting on the face F4 decreases as a result of evacuating the branch conduit 24, as shown in FIG. And displaces the closure plate 20 to the position shown in FIG. 3 where the opening 2 is sealed. When the opening 2 is sealed, the branch conduit 24 is evacuated.

When it is necessary to open the opening 2, the spool valve 25 is brought to the position shown in FIG. The pressure medium (air) flows through the branch conduit 24 and moves the piston 17 with the closing plate 20 to the right and the piston 9 upward according to the ratio of the piston faces, as shown in FIG. Move to the first position.

In the above structure, the surfaces F of the pistons 9 and 17
2 and F4 are each configured to alternatively receive the pressure exerted by the pressure medium, and the constant reaction force acting on them is such that the piston receives the action of the pressure medium alternatively. Sometimes, on the one hand, the closing plate 20 is displaced parallel to its plane or the plane of the opening 2, and on the other hand, the closing plate 20 is displaced or raised perpendicularly to its plane or the plane of the opening 2 so as to follow in a timely sequence Selected. Thereby, the desired pneumatic sequence control is achieved at very low cost and with a simple two-position spool valve.

In the embodiment shown in FIGS. 1 to 3, the pressure receiving surfaces F1, F3 of the pistons 9, 16 each receive a constant air pressure. Basically, it is possible to use springs, such as helical springs, to apply pressure to these surfaces, which springs can be formed as uniform as possible within their working range. .

As already mentioned above, in the embodiment shown in FIGS. 1 to 3, the housing 4 is fixed to the wall 1 of the tank.

FIG. 4 shows the piston rod 1 of the piston 9.
0 shows an embodiment of the closure device according to the invention, in which one end is fixed to a bracket 27 protruding from the wall 1. In this embodiment, only one housing 28 is provided, in which both the piston-cylinder units 5 and 12 are arranged, and the axes of the two cylinder bores extend perpendicular to each other. Otherwise, the arrangement of the actuation circuit of the closure device is substantially the same as that of the embodiment shown in FIGS. 1 to 3, and its operation is similar to that of the device shown in FIGS. . Elements of the apparatus shown in FIG. 4 are designated by the same reference numerals corresponding to elements of the apparatus shown in FIGS.

In both embodiments, the closure device is shown schematically. Practical embodiments may include more piston-cylinder units connected in parallel to each other, depending on the size of the closure plate.

Although the present invention has been shown and described with reference to preferred embodiments, various modifications thereof will be apparent to those skilled in the art, and the present invention is therefore limited to the disclosed embodiments and their details. Instead, departures therefrom are possible within the spirit and scope of the claims.

[Brief description of the drawings]

FIG. 1 schematically shows a vertical longitudinal cross section at the open position of the tank or conduit closing device of the first embodiment of the invention.

FIG. 2 schematically shows a vertical longitudinal cross section in a closed position of the tank or conduit closing device of the first embodiment of the present invention.

FIG. 3 schematically shows a vertical longitudinal cross section of the tank or conduit closure device of the first embodiment of the invention in a sealed position.

FIG. 4 schematically shows a vertical longitudinal cross section at the open position of the tank or conduit closing device according to the second embodiment of the present invention.

[Explanation of symbols]

1 ... wall, 2 ... opening, 3 ... closing device, 4 ...
Housing, 5 first piston-cylinder unit, 8 cylinder bore, 9 piston, 10, 1
1 ··· piston rod, 12 ··· second piston-cylinder unit, 13 ··· housing, 14, 15 ···
Cylinder bore, 16, 17, piston, 18. piston rod, 19, intermediate wall, 20, closing plate,
21 ··· conduit, 23,26 ··· long hole, 24 ··· branch conduit, 25 ··· valve, F1, F2, F3, F4.
・ Piston action surface

Claims (15)

[Claims] An apparatus for closing an opening in a tank or conduit, wherein said opening or closing is substantially perpendicular to the plane of said opening toward and away from said opening so as to be pressed against a wall formed with said opening. A closure plate for the opening being movable and displaceable substantially parallel to a plane of the opening at a distance from the opening, displacing the closure plate parallel to the plane of the opening; A first piston-cylinder unit having a housing with a cylinder bore and at least one piston displaceable within the bore; and moving the closure plate toward and away from the opening perpendicular to the plane of the opening. Having a cylinder bore and at least one piston displaceable in the bore,
And a second piston-cylinder unit connected to the closure plate for moving the closure plate toward and away from the wall where the opening is formed; and Conduit means for directing a pressure medium into the cylinder bores of the first and second piston-cylinder units for displacement. 2. The apparatus according to claim 1, further comprising pressurizing means for applying a substantially constant pressure to each side of the piston of the first piston-cylinder unit and the piston of the second piston-cylinder unit. Item 2. The closing device according to Item 1. 3. A pressure medium having a constant pressure is applied to one of both sides of a piston of the first piston-cylinder unit and one of both sides of a piston of the second piston-cylinder unit. Item 2. The closing device according to Item 1. 4. The variable pressure medium is applied to the other side of the piston of the first piston-cylinder unit and the other side of the piston of the second piston-cylinder unit. A closure device as described. 5. The closing device according to claim 4, wherein the first piston-cylinder unit has different sizes on both sides of the piston. 6. The closure of claim 5, wherein one side of the piston of the first piston-cylinder unit is smaller than the opposite side and one side of the piston of the second piston-cylinder unit is smaller than the opposite side. apparatus. 7. The closing device according to claim 1, wherein pistons of different diameters are provided on both sides of the piston of the first piston-cylinder unit, and the ratio of both sides of the piston is equal to 0.75. . 8. The second piston-cylinder unit,
It has two cylinder bores and two pistons of different diameters displaceable in each cylinder bore, the two pistons extending through an intermediate wall separating the two cylinder bores. 2. The closing device according to claim 1, wherein the closing device is connected by a piston rod. 9. The closure according to claim 8, wherein the ratio of the diameters of the two pistons is equal to 0.5. 10. The second piston-cylinder unit is connected by two cylinder holes separated by an intermediate wall and one piston rod extending through the intermediate wall, and is displaceable in each of the cylinder holes. And two pistons having different diameters,
8. The closure device according to claim 7, wherein the ratio of their diameters is equal to 0.5. 11. The piston of the first piston-cylinder unit has piston rods having different diameters on both sides thereof, and the second piston-cylinder unit includes:
Two cylinder bores separated by an intermediate wall and two pistons connected by a piston rod extending through the intermediate wall and displaceable in each cylinder bore; Have different diameters,
2. The closing device according to claim 1, wherein the value of the ratio of their diameters is smaller than the value of the ratio of the two sides of the piston of the first piston-cylinder unit. 12. A cylinder hole of the first piston-cylinder unit is formed in one of the piston rods provided on both sides of the first piston-cylinder unit.
The closing device according to claim 10, wherein two long holes communicating with the two cylinder holes of the piston-cylinder unit are provided. 13. The first and second piston-cylinder units are disposed in a common housing, and the axes of the cylinder holes of the first and second piston-cylinder units extend perpendicular to each other, and 2. The closing device according to claim 1, wherein one of two piston rods provided on both sides of the piston of the cylinder unit is fixedly held. 14. Displacing the closure plate parallel to the plane of the opening and moving the closure plate toward and away from the opening perpendicular to the plane of the opening in a timely manner. The first and second
6. The closing device according to claim 5, wherein the size of both sides of the piston of the piston-cylinder unit and the pressure acting on them are set. 15. The conduit means for displacing the closure plate parallel to the plane of the opening, and for moving the closure plate toward and away from the opening perpendicular to the plane of the opening. Are to be achieved in a timely manner,
15. The closing device according to claim 14, further comprising a two-position spool valve for selectively applying a variable pressure medium to the pistons of the first and second piston-cylinder units.